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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1383436f568570106a745f4a958d94a0226e5c91cece988748faaa3f9d943f9' 
  AND token = 'X9s2FcN3hpGXMDjZGkvnAIc2+NqwL2YfNp1hcPCS4As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}